Initial commit: img-infinite-canvas AI design workbench MVP

Moteva-style AI design workbench replica. Home prompt creates a project;
the project page provides an infinite canvas with node drag, zoom/pan,
a design chat panel, history replay, image asset upload, and project
save/regenerate.

- Backend: go-zero, DDD layering, sqlc/pgx, optional PostgreSQL; memory
  or Redis cache; asynq job queue; MinIO/S3/R2/OSS object storage;
  sky-valley/pi agent runtime adapter.
- Frontend: Next.js App Router + Vite artifact build, TypeScript, i18n,
  shadcn/ui components, auth (OTP/Turnstile/Google/WeChat).
- Deploy: Docker Compose and k3s manifests.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/internal/infrastructure/websearch/duckduckgo_test.go

@@ -0,0 +1,41 @@
+package websearch
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestParseDuckDuckGoResults(t *testing.T) {
+	body := `
+<a rel="nofollow" class="result__a" href="//duckduckgo.com/l/?uddg=https%3A%2F%2Fexample.com%2Ffashion&amp;rut=abc">Fashion Website Design</a>
+<a class="result__snippet" href="//duckduckgo.com/l/?uddg=https%3A%2F%2Fexample.com%2Ffashion&amp;rut=abc">A <b>fashion</b> ecommerce homepage reference.</a>
+<a rel="nofollow" class="result__a" href="//duckduckgo.com/l/?uddg=https%3A%2F%2Fexample.org%2Fhoodie&amp;rut=def">Hoodie Brand System</a>
+<a class="result__snippet" href="//duckduckgo.com/l/?uddg=https%3A%2F%2Fexample.org%2Fhoodie&amp;rut=def">Brand and hoodie visual language.</a>`
+
+	results := parseDuckDuckGoResults(body, 5)
+	if len(results) != 2 {
+		t.Fatalf("expected 2 results, got %d", len(results))
+	}
+	if results[0].Title != "Fashion Website Design" {
+		t.Fatalf("unexpected title: %s", results[0].Title)
+	}
+	if results[0].URL != "https://example.com/fashion" {
+		t.Fatalf("unexpected url: %s", results[0].URL)
+	}
+	if results[0].Snippet != "A fashion ecommerce homepage reference." {
+		t.Fatalf("unexpected snippet: %s", results[0].Snippet)
+	}
+}
+
+func TestBuildVisualSearchQueryForLogoReferencesAvoidsMakerTools(t *testing.T) {
+	query := BuildVisualSearchQuery("Moteva 让设计变简单懂你的设计 Agent，帮我搞定一切设计需求，制作一个 logo")
+
+	for _, want := range []string{"AI design agent", "logo 设计稿", "设计思路", "brand identity", "-maker", "-generator", "-template"} {
+		if !strings.Contains(query, want) {
+			t.Fatalf("expected query to contain %q, got %q", want, query)
+		}
+	}
+	if strings.Contains(query, "制作一个 logo") {
+		t.Fatalf("expected query to avoid raw prompt wording, got %q", query)
+	}
+}